Added NZ catalog reader

[KennyGraham1]

pyCSEP Pull Request Checklist

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Fixes issue #(please fill in or delete if not needed).

Type of change:

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update (this pull request adds no new code)
• Unpublished science feature (This may require a science review)
• This change requires a documentation update

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[codecov-commenter]

Codecov Report

Patch coverage: 63.46% and project coverage change: +0.25 🎉

Comparison is base (e50167f) 54.36% compared to head (6a31474) 54.62%.

❗ Current head 6a31474 differs from pull request most recent head 05995f3. Consider uploading reports for the commit 05995f3 to get more accurate results

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
+ Coverage   54.36%   54.62%   +0.25%     
==========================================
  Files          21       22       +1     
  Lines        3802     3905     +103     
  Branches      636      650      +14     
==========================================
+ Hits         2067     2133      +66     
- Misses       1603     1637      +34     
- Partials      132      135       +3     

Impacted Files	Coverage Δ
csep/__init__.py	26.11% <5.26%> (-2.88%)	⬇️
csep/utils/readers.py	46.08% <28.57%> (-0.37%)	⬇️
csep/core/catalogs.py	61.02% <50.00%> (+0.06%)	⬆️
csep/utils/geonet.py	81.57% <81.57%> (ø)

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[fabiolsilva]

Hi Kenny, thanks for sending the revised pull request. I ran the tests and things seem to work fine. I went through the code today and had a discussion with Bill regarding a few of these changes. Please take a look at my comments, and let me know if you have any questions.

Thanks!

[KennyGraham1]

@fabiolsilva I've committed the new yaml file. Thanks